857471918 has 4 divisors (see below), whose sum is σ = 1286207880. Its totient is φ = 428735958.

The previous prime is 857471917. The next prime is 857471941. The reversal of 857471918 is 819174758.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857471917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214367978 + ... + 214367981.

It is an arithmetic number, because the mean of its divisors is an integer number (321551970).

Almost surely, 2^857471918 is an apocalyptic number.

857471918 is a deficient number, since it is larger than the sum of its proper divisors (428735962).

857471918 is a wasteful number, since it uses less digits than its factorization.

857471918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428735961.

The product of its digits is 564480, while the sum is 50.

The square root of 857471918 is about 29282.6214331982. The cubic root of 857471918 is about 950.0357947732.

The spelling of 857471918 in words is "eight hundred fifty-seven million, four hundred seventy-one thousand, nine hundred eighteen".